WO1994006578A1 - Procede visant a supprimer l'influence qu'exercent les excentricites des rouleaux sur le reglage de l'epaisseur des produits a laminer passes dans une cage de laminoir - Google Patents

Procede visant a supprimer l'influence qu'exercent les excentricites des rouleaux sur le reglage de l'epaisseur des produits a laminer passes dans une cage de laminoir Download PDF

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Publication number
WO1994006578A1
WO1994006578A1 PCT/DE1993/000894 DE9300894W WO9406578A1 WO 1994006578 A1 WO1994006578 A1 WO 1994006578A1 DE 9300894 W DE9300894 W DE 9300894W WO 9406578 A1 WO9406578 A1 WO 9406578A1
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WO
WIPO (PCT)
Prior art keywords
signal fluctuations
control
roll
eccentricities
zone
Prior art date
Application number
PCT/DE1993/000894
Other languages
German (de)
English (en)
Inventor
Klaus-Dieter Berger
Original Assignee
Siemens Aktiengesellschaft
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens Aktiengesellschaft filed Critical Siemens Aktiengesellschaft
Priority to US08/403,920 priority Critical patent/US5600982A/en
Priority to DE59305091T priority patent/DE59305091D1/de
Priority to EP93919021A priority patent/EP0662017B1/fr
Publication of WO1994006578A1 publication Critical patent/WO1994006578A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
    • B21B37/58—Roll-force control; Roll-gap control
    • B21B37/66—Roll eccentricity compensation systems

Definitions

  • the invention relates to a method for suppressing the influence of roll eccentricities on the control of the rolling stock thickness in a roll stand, the control providing a dead zone that is insensitive to signal fluctuations caused by the roll eccentricities, the zone width of which varies depending on the size of the signal fluctuations becomes.
  • the rolling stock thickness As an interesting control variable, cannot be easily measured in terms of control technology at the point of its creation, namely the roll gap, and therefore cannot be used to directly correct faults, e.g. Eccentricities of the rollers can be used. According to the so-called gauge principle, however, the instantaneous rolling stock thickness ha in the area of the roll gap can be calculated from the
  • AGC automatic gauge control
  • the rolling force is detected on the basis of this relationship by means of a rolling load detector and used to regulate the thickness of the rolling stock. If the roll gap increases, for example due to an increase in the inlet thickness of the rolling stock, this leads to an increase in the rolling force F w ; This increase is detected, the control position s of the rollers being reduced by the control, so that the rolling force F w increases further and the rolling stock thickness is regulated back to its target value becomes.
  • the rolling stock thickness ha is not available alone, but only together with the roll eccentricity ⁇ R, which causes a periodic increase and decrease in the rolling force F w during the rolling process.
  • the increases and decreases in the rolling force F w caused by the eccentricities are, however, incorrectly interpreted by the AGC system as an increase or decrease in the roll gap, as a result of which the rolling force F w is automatically increased or decreased via the setting position s and so that the full extent of the eccentricities is rolled into the rolling stock.
  • the object of the invention is to optimize the adaptation of the width of the dead zone as a function of the eccentricities that occur.
  • this object is achieved in that, in the method of the type mentioned at the outset, the zone width is varied as a function of an ongoing statistical evaluation of the signal fluctuations.
  • the zone width is varied as a function of an ongoing statistical evaluation of the signal fluctuations.
  • the standard deviation of the signal fluctuations from their mean value is used to determine the zone width.
  • the standard deviation is used to determine a variable that optimally reflects the current extent of the eccentricity-dependent signal fluctuations for setting the dead zone.
  • the determination of the standard deviation is particularly simple to perform in terms of computation, as a result of which the hardware or software expenditure for realizing this computing function is comparatively low.
  • the values continuously determined for the standard deviation are weighted with a predetermined factor of the order of about 1 to A, preferably 2 to 3.
  • the statistical evaluation of the signal fluctuations is based on an observation period that is based on the roller circulation period or a multiple thereof of corresponds. In this way it is taken into account that the signal fluctuations, despite their unpredictable, A So correct statistical nature with the rotation of the roller.
  • the signal fluctuations for their statistical evaluation determine base values with a sampling frequency which is in a fixed relationship to the roller speed. This results in a number of base values independent of the roller speed within the observation period, which makes it possible to predefine a specific computing capacity for statistical evaluation.
  • signal fluctuations occurring at different points within the control can be used to set the width of the dead zone, provided that they correlate with the roller eccentricities.
  • the signal values applied to the dead zone on the input side are preferably used for statistical evaluation.
  • control system provides a zone which is insensitive to signal fluctuations caused by roller eccentricities and whose zone width is varied as a function of the signal fluctuations Improvement of the zone width and other influencing variables, for example for precontrol, on the basis of the techniques of processing unsharp certain input variables, in particular taking into account expert knowledge with regard to the process variable measurement value distribution and distribution occurring.
  • a cost-effective, fast implementation of the improvement of the control which can be checked in particular by computer simulation, and the possibility of adapting the influence of the results of the control by the neural network or the fuzzy computing process is advantageously achieved by the in the further subclaims specified measures achieved.
  • FIG. 1 shows a block diagram for the control of the rolling stock thickness in a rolling stand
  • FIG. 2 shows an example for the setting of the width of the dead zone as a function of the standard deviation of the detected signal fluctuations
  • FIG. 3 shows an example for the course of the signal fluctuation kung and and the adapted dead zone
  • Fig. A an example of the computational procedure in a rolling process control
  • Fig. 5 and 6 exemplary configurations of a neuro computer network value.
  • FIG. 1 shows the block diagram of an AGC (auto atic gauge control) control for a roll stand 1 with an upper and lower support roll 2 or 3, two work rolls A and 5, and a hydraulic adjusting device 7 which can be actuated via a control valve 6 Setting the arrival Position s and a spring c «emulating the elasticity of the roll stand 1.
  • the rolling stock 8, to which an equivalent material spring c M can be assigned in the roll gap, is rolled down by the two rolls A and 5 from an inlet thickness h to an outlet thickness h.
  • the roll eccentricities can be described by an effective change in the roll radius ⁇ R.
  • the setting position s is measured with a position sensor 9 on the setting device 7; the support roller speed n is recorded by means of a tachometer 10 on the support roller 3 and the rolling force F w is measured by means of a pressure sensor 11 on the roll stand 1.
  • the measured actual value of the rolling force F w is fed to an adaptation amplifier 12 which reproduces the stand characteristic curve c r and which produces the actual springing value P w c G on the output side.
  • the actual suspension value P w c G is supplied with a negative sign to a summing point 13 at which, according to equation (1) given above
  • the summing point 13 is supplied with a value s ,, instead of the actual value of the setting position s.
  • the difference signal at the output of the summing point 13 therefore not only contains
  • the difference signal at the output of the summing point 13 is fed with a positive sign directly to another summing point 1A, which additionally has the same difference signal. is supplied via a limiter 15 with a negative sign.
  • the limiter 15 transmits from the signal fed to it only those signal amplitudes which lie within a range x which preferably corresponds to the amplitudes of the eccentricities ⁇ R, so that precisely this amplitude range does not appear at the output of the summing element 1A.
  • the limiter 15 thus forms, together with the further summing element 1A, a dead zone for all signal amplitudes which lie within the range b.
  • the width b of the dead zone is set in such a way that it is suitable for those of the signal eccentricities R caused by signal fluctuations is insensitive.
  • the signal at the output of summing point 1A which is free from the eccentricity-dependent signal fluctuations R, is fed to a roll gap controller 16 with a downstream correction amplifier 17, at the output of which a setpoint value s for the starting position appears.
  • the output signal of the roll gap controller 16 is multiplied by the factor 1 + c ../ c G , so as to influence the path gain of the control loop
  • the setpoint s at the output of the correction amplifier 17 is set via a delay device 18 with a delay corresponding to the natural time of the position control (position controller 22).
  • the output signal s of the correction amplifier 17 has a positive identifier and the output signal of the limiter 15 is a further summing point via an adaptation amplifier 19 with a negative sign as an additional setpoint ⁇ s
  • the final setpoint for the setting position at the output of the summing point 20 is compared at an additional summing point 21 with the actual value s supplied by the position transmitter 9, the comparison result via a position controller 22 and a downstream actuator 23 for actuating the control valve 6 and so that it is used to set the setting position s.
  • base values x are first obtained from the difference signal at the output of the summing point 13 by means of a scanning element 2A. detected and a device 25 for statistical evaluation of the base values x. fed. Over a period of observation of N _ support values x1. whose standard deviation s from the mean x with
  • the sampling is carried out as a function of the roller speed n.
  • a control pulse generator 26 controlling the scanning element 2A is provided, the output-side control pulse frequency of which is dependent on that with the tachometer 10 measured roller speed n is controlled. Since the observation period on which the statistical evaluation of the signal fluctuations is based is based on a predetermined number of N base values x. there is, the observation period is automatically adapted to the respective roll circulation time.
  • the determined value for the standard deviation ⁇ is multiplied in a correction element 28 arranged downstream of the device 25 by a predetermined factor in the range between 2 and 3 before it is sent to a control input 29 of the limiter 15 for setting the zone width b is supplied.
  • FIG. 3 shows an example of the course of the signal fluctuations caused by the eccentricities ⁇ R at the output of the summing point 13 together with the zone width b regulated as a function thereof.
  • FIG. 31 denotes the primary data input, for example the input dimensions, the material quality and the target values of the rolling process.
  • the primary data will be Appropriately prepared in terms of control technology and a pre-calculation 32 is given, which calculates the rolling parameters and the setting values for the rolling mill. From the pre-calculation 32, the data arrive in a time-correct distribution 33 for the setting values of subordinate controls and controls 3A of the rolling mill 30, which is only shown schematically here.
  • this feedback circuit is improved by the technique of regulating with unsharp input variables, in particular by neural networks, as shown by way of example in FIG. 5. A new self-learning behavior of the feedback circuit is achieved, which leads to a considerable improvement in the rolling technical result leads.
  • 39 denotes a simple neural network which is well suited for strongly scattering values, the network nodes AO, as indicated, having a local influence in accordance with Gaussian curves. 6 have network nodes AI in the neural network A2 which are sigmoidally influenced. Networks of this type are also, but less well, suitable for the control and improvement of processes with less widely scattering measured values and input variables.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Metal Rolling (AREA)

Abstract

On sait que, lors du réglage de l'épaisseur des produits à laminer passés dans une cage de laminoir, pour supprimer l'influence qu'exercent les excentricités des rouleaux, il faut prévoir une zone morte insensible aux fluctuations des signaux, dues aux excentricités des rouleaux et qu'il faut faire varier la largeur de cette zone en fonction de la grandeur des fluctuations des signaux. Afin d'améliorer la précision, la variation de la largeur de la zone (b) s'opère en fonction d'une évaluation statistique continue des fluctuations des signaux, ce qui permet de déterminer de préférence leur écart type (δ).
PCT/DE1993/000894 1992-09-22 1993-09-20 Procede visant a supprimer l'influence qu'exercent les excentricites des rouleaux sur le reglage de l'epaisseur des produits a laminer passes dans une cage de laminoir WO1994006578A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US08/403,920 US5600982A (en) 1992-09-22 1993-09-20 Method for suppressing the influence of roll eccentricities on the control of the rolled product thickness in a roll stand
DE59305091T DE59305091D1 (de) 1992-09-22 1993-09-20 Verfahren zum unterdrücken des einflusses von walzenexzentrizitäten auf die regelung der walzgutdicke in einem walzgerüst
EP93919021A EP0662017B1 (fr) 1992-09-22 1993-09-20 Procede visant a supprimer l'influence qu'exercent les excentricites des rouleaux sur le reglage de l'epaisseur des produits a laminer passes dans une cage de laminoir

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DEP4231615.4 1992-09-22
DE4231615A DE4231615A1 (de) 1992-09-22 1992-09-22 Verfahren zum Unterdrücken des Einflusses von Walzenexzentrizitäten auf die Regelung der Walzgutdicke in einem Walzgerüst

Publications (1)

Publication Number Publication Date
WO1994006578A1 true WO1994006578A1 (fr) 1994-03-31

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ID=6468488

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PCT/DE1993/000894 WO1994006578A1 (fr) 1992-09-22 1993-09-20 Procede visant a supprimer l'influence qu'exercent les excentricites des rouleaux sur le reglage de l'epaisseur des produits a laminer passes dans une cage de laminoir

Country Status (5)

Country Link
US (1) US5600982A (fr)
EP (1) EP0662017B1 (fr)
AT (1) ATE147296T1 (fr)
DE (2) DE4231615A1 (fr)
WO (1) WO1994006578A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0698427A1 (fr) * 1994-07-28 1996-02-28 Siemens Aktiengesellschaft Procédé pour supprimer l'influence des excentricités de rouleaux de laminage

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE59501395D1 (de) * 1994-03-29 1998-03-12 Siemens Ag Verfahren zur Unterdrückung des Einflusses von Walzenexzentrizitäten auf die Regelung der Walzgutdicke in einem Walzgerüst
EP0880598A4 (fr) * 1996-01-23 2005-02-23 Affymetrix Inc Evaluation rapide de difference d'abondance d'acides nucleiques, avec un systeme d'oligonucleotides haute densite
DE19618712B4 (de) * 1996-05-09 2005-07-07 Siemens Ag Regelverfahren für ein Walzgerüst zum Walzen eines Bandes
DE19642918C2 (de) * 1996-10-17 2003-04-24 Siemens Ag System zur Berechnung des Enddickenprofils eines Walzbandes
AT407015B (de) * 1996-12-04 2000-11-27 Voest Alpine Ind Anlagen Verfahren zur kompensation der exzentrizität der stütz- und/oder arbeitswalzen in einem duo- oder quarto-walzgerüst
US5961899A (en) * 1997-07-15 1999-10-05 Lord Corporation Vibration control apparatus and method for calender rolls and the like
DE102006008574A1 (de) * 2006-02-22 2007-08-30 Siemens Ag Verfahren zur Unterdrückung des Einflusses von Walzenexzentrizitäten
DE102007003243A1 (de) * 2007-01-23 2008-07-31 Siemens Ag Regelanordnung für ein Walzgerüst und hiermit korrespondierende Gegenstände
CN109670223A (zh) * 2018-12-07 2019-04-23 山西太钢不锈钢股份有限公司 一种立磨磨辊精度定位的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2643686B2 (de) * 1976-09-28 1979-07-19 Siemens Ag, 1000 Berlin Und 8000 Muenchen Anordnung zur Regelung der Walzgutdicke in einem Walzgerüst
US4580224A (en) * 1983-08-10 1986-04-01 E. W. Bliss Company, Inc. Method and system for generating an eccentricity compensation signal for gauge control of position control of a rolling mill
EP0446036A2 (fr) * 1990-03-09 1991-09-11 Hitachi, Ltd. Dispositif de commande
EP0534221A1 (fr) * 1991-09-24 1993-03-31 Siemens Aktiengesellschaft Dispositif d'amélioration avec paramètre de réglage pour installation industrielles
EP0560688A1 (fr) * 1992-03-13 1993-09-15 Sollac Dispositif de commande d'un outil d'écrouissage par laminage léger d'une tôle

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2036965C3 (de) * 1970-07-25 1974-04-18 Siemens Ag, 1000 Berlin U. 8000 Muenchen Anordnung zur betriebsmäßigen Erfassung und Auswertung von durch Exzentrizitäten der Walzen hervorgerufenen Walzkraftschwankungen in einem Walzwerk
JPS5626612A (en) * 1979-08-06 1981-03-14 Kobe Steel Ltd Controlling method for thickness of rolled sheet
JPS5992113A (ja) * 1982-11-15 1984-05-28 Nisshin Steel Co Ltd ロ−ル偏心制御装置
US4531392A (en) * 1984-03-19 1985-07-30 Aluminum Company Of America Phase compensator for gauge control using estimate of roll eccentricity
US4648257A (en) * 1985-08-30 1987-03-10 Aluminum Company Of America Rolling mill eccentricity compensation using actual measurement of exit sheet thickness
JPS62127114A (ja) * 1985-11-27 1987-06-09 Mitsubishi Electric Corp 圧延機におけるロ−ル偏心除去装置
JPS62254915A (ja) * 1986-04-30 1987-11-06 Toshiba Corp 多重圧延機のロ−ル偏芯除去制御装置
US4763273A (en) * 1986-07-25 1988-08-09 Kabushiki Kaisha Toshiba Apparatus for detecting eccentricity of roll in rolling mill
DE3935434A1 (de) * 1989-10-25 1991-05-02 Schloemann Siemag Ag Verfahren zur kompensation von durch walzenexzentrizitaeten verursachten stoerungen
SU1696027A1 (ru) * 1989-12-18 1991-12-07 Липецкий Филиал Всесоюзного Научно-Исследовательского И Проектного Института Систем Автоматизации И Управления Способ управлени многоклетевым прокатным станом
US5341663A (en) * 1992-04-22 1994-08-30 Aluminum Company Of America Automatic process control and noise suppression

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2643686B2 (de) * 1976-09-28 1979-07-19 Siemens Ag, 1000 Berlin Und 8000 Muenchen Anordnung zur Regelung der Walzgutdicke in einem Walzgerüst
US4580224A (en) * 1983-08-10 1986-04-01 E. W. Bliss Company, Inc. Method and system for generating an eccentricity compensation signal for gauge control of position control of a rolling mill
EP0446036A2 (fr) * 1990-03-09 1991-09-11 Hitachi, Ltd. Dispositif de commande
EP0534221A1 (fr) * 1991-09-24 1993-03-31 Siemens Aktiengesellschaft Dispositif d'amélioration avec paramètre de réglage pour installation industrielles
EP0560688A1 (fr) * 1992-03-13 1993-09-15 Sollac Dispositif de commande d'un outil d'écrouissage par laminage léger d'une tôle

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
H. STEFFENS ET AL.:: "Systemstudie, Ausführung und Ergebniskontrolle einer Dickenregelung mit hydraulischem Stellglied für eine Kaltwalzumkehrstrasse", STAHL UND EISEN., vol. 93, no. 10, 10 May 1973 (1973-05-10), DUSSELDORF DE, pages 429 - 435 *
P. BOHLÄNDER ET AL.:: "Neue Möglichkeiten der Banddickenregelung in Kaltwalzstrassen mit hydraulischen Anstellantrieben", STAHL UND EISEN., vol. 95, no. 19, 11 September 1975 (1975-09-11), DUSSELDORF DE, pages 879 - 884 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0698427A1 (fr) * 1994-07-28 1996-02-28 Siemens Aktiengesellschaft Procédé pour supprimer l'influence des excentricités de rouleaux de laminage
US5647237A (en) * 1994-07-28 1997-07-15 Siemens Aktiengesellschaft Process for suppressing the influence of roll eccentricities

Also Published As

Publication number Publication date
DE4231615A1 (de) 1994-03-24
EP0662017B1 (fr) 1997-01-08
ATE147296T1 (de) 1997-01-15
DE59305091D1 (de) 1997-02-20
EP0662017A1 (fr) 1995-07-12
US5600982A (en) 1997-02-11

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